期刊论文

Effect of initial moisture content on hot pressing drying characteristics of Quercus mongolica lumber

中文

中南林业科技大学学报

1673-923X

2018

38

9

120-125

10.14067/j.cnki.1673-923x.2018.09.019

林业科学技术国家级推广项目（[2015]51号）；

本校为第一机构

以白橡锯材为研究对象,采用平板热压机对其进行干燥处理,系统研究了初含水率对木材温变特性、干燥速率、干缩特性、干燥缺陷和微观构造的影响规律,探明白橡锯材的热压干燥特性.结果表明:热压干燥是一种高效快速的干燥方法,将初含水率为14% ~ 75%的木材在温度为140℃、压力为0.1MPa的条件下干燥到2%以下终了含水率仅需120 ~ 210 min,木材干燥速率随着初含水率的增加而增加;初含水率较高的木材在热压后会产生严重内裂和皱缩缺陷,当木材初含水率降至15%以下时,热压后无内裂缺陷产生,截面变形也明显减小;随着初含水率的增加,木材厚度干缩系数呈增加趋势,而宽度干缩系数则呈下降趋势.通过观察木材的横...

Effects of initial moisture content（MC） on the drying rate, shrinkage properties, drying defects and microstructure of dried wood were studied by press drying Quercus mongolica lumber pre-dried from green to 4 nominal MCs. The results show that cuttings with initial MCs varying from 14% to 75% could be press-dried at 140 ℃, 0.1 MPa to a final MC below 2% in 120-210 min with a markedly improved drying rate compared with kiln drying and the average drying rate were increased with increased initial MC. Press dried cuttings generally contained s...